Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7714b&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #77.14; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We show that compressible turbulent motions on scales smaller than CR mean free path induce gyroresonance instability in CRs. This CR-Alfven wave instability provides efficient scattering of CRs much like streaming instability, but without streaming. The amplitude of the new slab-type Alfven waves generated by instability is restricted by steepening, while on large scales it is damped by turbulent shearing. The energy transfer from compressive turbulence to the slab waves provides a new mechanism of damping of compressive motions that is efficient in a media with relatively large CR pressure. For the typical parameters of turbulence in the ICM or ISM the instability provides scattering frequencies that are much higher that those given by quasilinear theory from the direct resonance with MHD turbulence modes.
Beresnyak Andrey
Lazarian Alex
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